Question about Stanley Bostitch MIIIFN Flooring Nailers

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I have rebuilt an mIII flornailer and it is still hissing air out of the top

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If you have replaced all the o-rings and the unit is still leaking air, there a couple of things possibly wrong. One, there may be an o-ring that came out of its groove and is leaking, or possibly the main stem of the piston assembly is worn down to the point where the o-rings can't seal anymore (even new ones)The stem will need to be replaced. Either way you are going to have to open the unit up again and see whats up.

Posted on Jan 13, 2011

  • joshzazula
    joshzazula May 02, 2012

    You said the main stem could be worn down so the o rings don't seal, but the main stem doesn't have any o rings on it. How would the stem be the problem? I have an miii and I replaced the o ring kit twice and it still leaks. My friend told me the same thing you said and bought me a new stem, but I do not understand how this part can be the issue. Can oyou please explain?



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